/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using ASC.Core;
using log4net;
using System;
using System.IO;
using System.Linq;

namespace ASC.HealthCheck.Classes
{
    public class DriveSpaceChecker : IDriveSpaceChecker
    {
        public long TotalFreeSpace { get; private set; }
        public long TotalSpace { get; private set; }
        public string DriveName { get; private set; }

        private readonly ILog log = LogManager.GetLogger(typeof(DriveSpaceChecker));

        public DriveSpaceChecker()
        {
            TotalFreeSpace = -1;
            TotalSpace = -1;

            try
            {
                DriveName = Path.GetPathRoot(AppDomain.CurrentDomain.BaseDirectory);
            }
            catch
            {
                DriveName = "C:\\";
            }
        }

        public void GetTotalAndFreeSpace()
        {
            log.DebugFormat("GetTotalAndFreeSpace: driveName = {0}", DriveName);

            var docker = WorkContext.IsMono && File.Exists("/.dockerinit");

            // Reverse because A:// is inactive and slow
            foreach (var drive in DriveInfo.GetDrives().Reverse())
            {
                if (drive.IsReady && (drive.Name == DriveName || docker))
                {
                    TotalFreeSpace = drive.TotalFreeSpace;
                    TotalSpace = drive.TotalSize;
                    log.DebugFormat("GetTotalAndFreeSpace: DriveName = {0} TotalFreeSpace = {1} TotalSpace = {2}", DriveName, TotalFreeSpace, TotalSpace);
                    return;
                }
            }
        }
    }
}